Clearing means the removal of all vegetation, while grubbing is the removal of roots that may remain in the soil.
This includes the removal of all logs, brush, and debris, further as grinding and removal of stumps.
We can divide all work sequence wise into 8 sections and discuss one by one:
- Scope of Work
- Preservation of Property / Amenities
- Method Statement
- Disposal of Material
- Work Safety
- Environment Safety
Scope of Work
The work shall consist of cutting, excavation, removing and disposing of all materials such as trees of girth up to 300 mm, bushes, shrubs, stumps, roots, grass weeds, rubbish etc. and top soil up to 150mm declared unsuitable by the Engineer, including draining out stagnant water if any from the area of road land, drain, cross drainage structure and other area as specified in the drawing or instructed by Engineer. It shall include necessary excavation & back filling of the pits, by suitable soil, resulting from uprooting of trees & stumps and making the surface levelled by suitable equipment and compacted by the power roller to required compaction as per Clause 305.3.4 of the Technical specification. The work also includes handling, salvaging and disposal of cleared material. Clearing and grubbing shall be done well before starting the earthwork operation and in accordance with requirement of project specification.
I) Ministry of Road Transport & Highway Specifications
II) Technical Specifications.
3. Preservation of Property / Amenities
Suitable safeguards shall be ensured with the approval of Engineer to protect the road side amenities, erosion & water pollution by the exposed surface of slopes & cut formed during the clearing & grubbing operations, shall be prevented through the use of berms, dykes, sediment basins, slope drains, grasses or other suitable devices as per Clause 201.2 of MORT&H.
The following equipments shall be used to carry out the Clearing & Grubbing operation.
- Excavator / J.C.B.
- Tipper / Tractor Trolley.
- Water tankers
- Survey Kit / Instrument
- Dozer with all attachments.
5.0 Method of Operation
5.1 The toe line shall be jointly (both by contractor & consultant) established, with reference to the alignment based on the levels taken earlier. The area for clearing & grubbing shall be jointly identified, covering areas of road embankment, drains, cross drainage structures and such other areas as specified.
5.1 a. Enumeration of Trees girth more than 300 mm falling within the Toe line shall be prepared and got approved for measurement prior to cut. Modes of measurement shall be done according to clause 201.5.
5.2 Trees up to 300 mm in girth and stumps and roots shall be removed by the suitable equipment or by manual labour means.
5.3 The Grader / Excavator / Dozer shall be deployed to remove all shrubs, bushes, vegetation, grass, weeds, rubbish and top organic soil not exceeding 150 mm in thickness, which in the opinion of Engineer is unsuitable for incorporation in the work.
5.4. The above machines & tools shall be deployed to carry out the Clearing & Grubbing operation and the bushes, stumps falling with in the excavation and fill lines shall be cut to the depth below ground level that in no case these fall within 500 mm of the sub grade, also all vegetation and deleterious matters unsuitable for use in the embankment & sub -grade should be removed between fill lines .
5.5 All branches of the trees extending above the highway shall be trimmed.
5.6 All excavation below the general ground level done to remove the trees shall be filled with suitable approved material and compacted to the density as required by the contract specification.
5.7 The existing soil of natural ground shall be tested for its suitability. In the event of the material nonconforming to the MORT&H specifications, it shall be removed and replaced with the approved material & compacted with Vibratory Roller to achieve the required density of 95%. In case where ground level is less than 0.5 M required density shall be 97%.
5.8 OGL will be taken after clearing and grubbing and compaction.
6.Disposal of the Materials
6.1 Materials collected from Clearing and Grubbing is disposed off to the specified places as per the Engineer’s instruction.
6.2 Stacking of cleared stumps, branches & boulders shall be done neatly at the approved location up to a lead of 1000 M.
7. Work Safety
Safety aids shall be mobilized in required number to take care of the workers & of the adjoining road users.
7.1 Minimum of two flagmen with reflective vests holding a red flag each shall be deployed to control the traffic which may be affected by clearing & grubbing operations.
7.2 All locations adjacent to the existing road where clearing & grubbing is progressing shall be provided with visible safety & road signs.
7.3 No machines or equipments shall be permitted to remain on the existing road or shoulder unattended at all times unless it is properly protected & secured in a safe manner.
7.4 The safety Officer shall make frequent patrols along the highway to ensure the safety of equipment & signs are operational at all time.
7.5 Borrow pits shall not be dug in the right-of-way of the road. Also it has to be ensured that the borrow area is being placed in the prescribed zone at the site and also ensure about the soil characteristics of the borrow area like slope, ground water level etc.
1.Deleterious matters detrimental to the environment shall be disposed off at the designated locations as per direction of the Engineer.
2.Vehicles tracks shall be kept moist to prevent flying of dust particles with the vehicle movement.